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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a54111387083898c790825a2e8fe8d9d97917035efad8792f97b1e7bb260ca' 
  AND token = 'DEVQiXD+1JF8++2xfSJe3A8DIMkr5pGLmxIxb7mUrcU=' 
  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"
    }
  }
}