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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b506ada75e1d3efe3df45ba7c812863f0208f0bcdc09b987105eac8ded8e0cc' 
  AND token = 'VycECPSS3DkwU1n5yEorbwmhQXwHQ366EiB0kT2h05s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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