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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42227fb5c7ce82f65ef4e88f2faeed242e59c9420e72437f069a512b39168488' 
  AND token = 'Wj0lUUyp+q8R8eYBKFstCcBuefdjRs3eBHwuqtfOS+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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