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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7501c5e45015996aed7f488f303c59bc07d88d2d96bd267ffcc8f8e4cfddc525' 
  AND token = 'R0t5osPuAk8yii/SYejJXxsgIMr+dFl9m1QhfugxziI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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