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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75da3124bba61fe62986bb3de134b713d85f287c7f17077e34ff54ede0a6660' 
  AND token = 'nqnziP40Ggn4BPQJagu1nmddSOLR3lH1BcaMuZgqKr4=' 
  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"
    }
  }
}