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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4111997e557b4d235b4344d187287eedffb7b931b4e8d02194d690756312817d' 
  AND token = 'gFjQJ+xtEox2Zw7IZ4piO9Qh+4rp+wEwVxY7+Wj3mwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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