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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6271603503cd904b639ada3d6af3583e5423edc8926c3fa31195351ef2e459d9' 
  AND token = 'KNxOpoHrPgD6GXY73P7mRbSmT/iozqY2TR6dSBI4y/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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