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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b18e4c6a705c5a89552f6f55438fb0e3ae122bbd1005c1b3c06110950ddf0d2' 
  AND token = 'cPoKHhz8kj8kR1Y+Yc1pqH2HLEyk3R7Ln3qG33q5lqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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