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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cfd7df161d737d74890915dca8a7fb5b39ae7e4d59c95d68859da02a128569' 
  AND token = '7DPSMNmQdn3BkCx5Jt1Pb5icj5yjxRp7KKA4tHlkFNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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