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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a6b62cf8703fe76622d65d4bf61f2e254188cc7101711a9d40b60cb3bed57c' 
  AND token = 'ANsdWSGomVBMx7/O+QeWDogqnwGuw5stmgH03QHjE5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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