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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed82288174a69da4d5cd84d94e3be1adff12feb739dedffb89184c0af4ee6d4' 
  AND token = '+8s+kkSFqJiRDW4dl5F3OxRAIihJfEC0Pj6Acs2xPLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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