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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d0b750b46a72d8ea98d995c504e21ed87882cfc68b5caafadb4983499b56c3' 
  AND token = '2pMbIUynl+CLc8IR9EvgKxO9amY21gfae3EYwsM81sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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