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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4d6de3e7335a042e44912157426230f3564264609e58dd1972627b3e252edd' 
  AND token = 'mIJmqgfjc7PzR5l0qdaZtokF+ry86oe4+YL4mTpUGsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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