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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fced2b6cd0088d5f514cd985c26a64e06392b015d79f9ee790cba37ec01280' 
  AND token = 'i3gwzgOICiRuOuyiDKb5eoqihH+Td+1MoFPAL+67AP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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