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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052feb1db5c425d31b13464b244c16c296ef125f5288e20f10b38d0b1a52f30c' 
  AND token = 'JY5WSeaT38S/R2zIXNEZH4ObXztjq4g85h9UuBpQ6tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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