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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5142fa42ca3bf89db8de337b3c17a3e6912700c21e4f3583e7fc7e4a43641b2f' 
  AND token = '9CdFq99eQlnJGJni3c5kTwvREMG9blXxQMnlv7RG9Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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