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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8b15977ba82bf3c3601989d4397bd9aad31246165c762c9079375b8de835c7' 
  AND token = 'kg0xFLDxsD4q7XWg23io0KD+Vs0O3F3VCp8v8O+eNrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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