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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212c776a824a43ef2ada8c55fa6027436095add52d4ea1c2bc297e26325227b6' 
  AND token = '5d0cudDSeXju+danuU5F9QpA4/bL/WfF24yJNqdcwb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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