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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de793f226a051047708ea5dd4e2034e8075e3d9ca11c37554ae6c537e8f530f' 
  AND token = 'fcGEl2q+CR32Ihwm18D2W9L02CpfMFrIx5ZEqS9tM2w=' 
  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"
    }
  }
}