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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090c534f48932844156ffe9b8e544b900e0b368728e3bf94ef25e352ac43dc5b' 
  AND token = '/8PBli/N/IZSCPpngue3lrFWS90kmyosMmWhuB+s9aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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