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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997b2412481077ac27d3d900aa1d854e7692c716f8d5d2401d4da4a0b9707f38' 
  AND token = 'DI2Dn1ISD91lT9IIViTJeu0Ii2oB0yCrIROJPcXvTfY=' 
  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"
    }
  }
}