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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4249226419096ef6e82892a30836eee6f78192ebe86e966edb87249a35940676' 
  AND token = 'tsyIQD3NTMnqJr2Waz4GoRDn73NX3OaCCZf26grWhz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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