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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ee0238e15125c4d4164f4823cb8816bcd5178da0df95c73de10fb2a7bf89a7' 
  AND token = 'rFVur0oFgda9hkyTfWq/7D9VJb54qsvu9xI/sNkzPHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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