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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae35f27e133bc092488336754b38f1e07d0207cc29d141f38fbbeb0c0b0a16e' 
  AND token = 'L2MuwiNDoTPQERhVLB06ceInHrgLx/M4l8MPOchsFMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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