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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d5b1e2dcdb87575288e3fb62842554b0bd56c4068311130dd435c475d9a243' 
  AND token = '4LhiG9HNkmC3ETDm9Cd+OWnKjeRrf1eNpx2IRbGcguo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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