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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff3b72d5f543f440c5176ac097a5ff736165ed1bcc4e90d52af264314231dfc' 
  AND token = 'LLnsuCYyYyq4tys/8fl7s3CIL4CmaV5V1BA1v1mF/60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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