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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae859a2dba4ff67063a9451b2d23903ba239a5a5eb1d4d480c1c153db6f902ae' 
  AND token = 'kQbNKi4f5xl+PRL+Bnu7P4Vy6uewLW2Rf/WvrYRH5HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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