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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f43aa07da04284aa45118491879dec653372850dd49988818c37ca2a196285' 
  AND token = 'WTxCFcp9rL1dMg3ia7GH6wYUldGTM6bv77myB7Acp4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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