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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ea3cabc9142719ed99846558fe66be05335351fce0790a0603f6faa382ddcc' 
  AND token = 'n1eou/XC3rYG5z2C7zBRbXIjDiqzojdO4+24S4bQ8jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}