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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c536cebc284b38ab831920276b5ce21c83e607597def1e714b37a3bc9bb5ad' 
  AND token = '6h31ziE1hV4ZcjgrGAsxNPthngbX+oIdxU4rPgqtQOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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