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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcc6f100075bb98e8d46ea12800c3f0072fc53b27ad9bdb016765ff39d8f7ba' 
  AND token = 'cr70tL2GE8yK7bPfoRkk6i3ze+s4jVNKJQ7YG3NakC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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