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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923b57c1471e056fa79999e405b2d346543dd8a85567d0b0379e2c8cf4d76abe' 
  AND token = 'cpYb72hSC8bz8Gik1fl4NxFiJK6yeczcXiCMeUMDii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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