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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7e8092916fe6df094b25f8c78daae82bf7d4b05c2974b308112a7c4572c666' 
  AND token = 'P2rEs/FfaXIG5Ai+symclz340DIIzu9//RPCB/u+9xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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