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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc3b8711e4aa4e2de179fc75010d212edabb2df4ce47e2c95bb6cbd58d7882f' 
  AND token = 'c54FmZxEHr0KtoSnapBsIaSE/N8r3BA/Ixzn/4wymtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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