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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06de47c1b9f2c2b9bbd321848706a97979d9c1ad232f08bd6323148c52f4263' 
  AND token = '4lxRWysH+T9p3c4ohkDBUo8LnmnrNbCOKImqRBY3vN0=' 
  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"
    }
  }
}