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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9acefc1eb9cce221e52fb55d2d86eaf27f0c658e56e71be77ba5226c3bda9e' 
  AND token = 'aAc9Cg3s3ClZiaXzDMTo9VLaWi6Vb5mpK+Ii1iN7Shk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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