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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee28102dc00591f3e10d9019128e140f7245b5dd1a6772f4a4dae71c8591714' 
  AND token = '+eEFiuFTTI1XF6Df9xXDFUPzjL/mRLiLBeRsWHp4s+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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