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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa90d890b0b92cf7c8271232d4dbe20b708bf7a6b107b3a60cc551bacade395' 
  AND token = 'V12Xz6+BT0APYlE6Q9rdT/XCtyRbYBCi5RAPrTayIUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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