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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85d47a71b74c985b82a1d32f514c0b29098dc59dbb4e8f73781002cd665bcb4' 
  AND token = 'dq/K5c+H6ingeN+VR6r10/9aI7AR+Ud+s3aIou3GYe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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