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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70402f22ae83ec211b0f14ee73ec3c66de322bfaf0d14bfe1d5ce60e87f3ba8' 
  AND token = 'PZjP446SPlG1RGi5g7bVO4WvsxnHyU9FaYmA99/2pPg=' 
  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"
    }
  }
}