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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9c4f2df6fde375066d04167f99af23400b1b9d4f27835fa88a43e0033fa00e' 
  AND token = 'i+CkGg9UWwcvF6YrYV/tE59QnTU0jt2l0arWzO2SrN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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