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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae6fbf3e79ce22ff42fab8202c85cd1c50addfc4621e3f56520e494eb3bd05f' 
  AND token = 'm06GAjfus4b3kWQIuG95DqcnMLVy1kWNAZvLUjFMuI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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