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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7131bf7b4dac542d9af85720af3a97b901b639303f65cee5e13d82fa564c53ae' 
  AND token = '5ZDffeffRGuemikUYvx5A3ZqRAa0rRBFHYMZw+7nnhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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